摘要： - Where is Mr. Wang? - He is not here. He must the students’ papers in the office. A. correct B. have corrected C. be correcting D. corrects

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— Where is Mr. Wang?
— He is not here. He must _______ the students’ papers in the office.

— Where is Mr. Wang?

— He is not here. He must _______ the students’ papers in the office.

A．correct B．have corrected C．be correcting D．corrects

— Where is Mr. Wang?
— He is not here. He must _______ the students’ papers in the office.

— Where is Mr. Wang?— He is not here. He must _______ the students’ papers in the office.